CEAGES CROSSWORD

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Across
  1. 6. Sudden movement of soil and rock
  2. 9. Unwanted materials
  3. 11. system for circulating air
  4. 12. Energy sources like wind and solar
  5. 13. Transparent material
  6. 14. Design of buildings
  7. 16. wall system
Down
  1. 1. structure spanning obstacles
  2. 2. Access between floors
  3. 3. Angle of terrain
  4. 4. type of soil
  5. 5. support for bridges
  6. 7. Foundation material
  7. 8. support structure for buildings
  8. 10. exterior of a building
  9. 15. Vertical support